Fuel-feeder.



W. H. HARDING a C.

FUEL FEEDER.

APPLICATION NLBD was. 190B.

W. H. HARDING & C. M. SAEGBR.

FUEL FEEDER.'

. APPLXGA'IION FILED AUG, 8, 1908 Patented Nov. 16, 19094 3 SHEETS-SHEET 2.

5mm f3 SMM J, M, SAEGER.

ELDER.

APPLIOATION FILED AUG..19o.

fz. HRTING FUEL P Patented Nov. 16, 1909.

3 SHE TS-SHEET 3.

fix/VEN we 5 i away and a sideview of a burner embodynarran secarse regresar onirica.

WILLIAM E. HARDING, 0F PHILADELPHIA, ANIG CHARLES M. SAEQER, OF LLENTOVZTN,

. PENNSYL'VANA.

FUEL-FEEBER.

VSpeccaten oi Letters Patent.

Patented Nev. i6, i969.

Application filed August 8, 1908. Serial No. LMSSG.

at Philadelphia, in the county of Philadel-- phia and State of Pennsylvania, and CHARLES M. Samoan, a' citizen of the United States, residing at lrllentovvn, in the county of Lehigh and State of Pennsylvania, have jointly invented certain new and useful lmprovenients in Fuel-Feeders, of which the following is a specification.

Objects .of the present. invention are to rovide for economically burning pulverizedy fuel, as coal, for example, in rotary cementkilns, boilers and other furnaces, and to distribute the particles of powdered fuel and thereby promote rapid ignition and coniplete combustion of all of them.

In order 'to des ribe the invention reference will be made to the accompanying explanatory drawings showing embodiments, but not the only embodiments or applications of the invention, and in those drawings Figure l, is a view principally in cen-n tral section illustrating a fuel feeder embodying features of the invention and showing in connection therewith portions of a rotary cement kiln. Fig. 2, is an end view, looking toward the right, of the spreader shown in Fig. l, with thecasing removed. Fig. 3, isa View looking toward the left of the plate shown in Fig. l. Fig. 4, is a side View illustrating a detail of construction that may be resorted to. respectively a plan view with parts broken ing a modification of the invention. Figs. -7 and 8, are similar views with parts broken away of a device embodying another modiicationof the invention, and Fig. 9, is a side View, partly in section, showing another' modification of the invention.

For the sake of explanation the invention Will be described in application to a rotary cement kiln, although 1t must be borne in, mind that it is applicable to other uses.

l-:l the drawings l, is a hopper from which powdered coal, or like fuel, is fed. It is provided with a feed extension 2, fitted with a' rotary feed device or screw 4, is an air su ply pipe, trunk or main. 5, is a rotary which is fitted at one end with an ott'- tlake for the products of combustionand an intake for the cement mixture, 'and at the other end with an outlet for the burned ce- Figs. and G, are

i 1 nient mixture. These parts are Well um derstood and do not need ther description.

Referring to the fuel feed-er, 6 is a casing prm [ded with an air discharge nozzle 7, and iiiV rear of the discharge end of the nozale, with a fuel feed inlet 8. The nozzle 7, communicates with the air pipe fl, by means of a pipe 9, which may be provided with a valve or gate l0. rifhe fuel inlet S, receives particular or fur .the fuel from the hopper l, by way of a pipe ll. lIt. has been said that the discharge end ot' the nozzle Y, is arranged in advance of the fuel inlct 8, so that an air jet issuing from the nozzle draws the powdered fuel forward and carries it from the casing 6.

The casing may be provided with a`hand hole and cover l2, and with an inclined par-- tition i3. Connected with. the discharge side of the casing 6, is a conical or flaring shell let, tern'iinating in a plate or head l. its shown in Fig. l, the casing lil is of the form ot' a frustuin of a cone. As shown in Figs. 5 to 8', the shell 14a, is flaring, but is generally rectangular in cross-section, so

that the form of the shell may be varied.-

From the plate lfprojects a series of straight tubes 16,- thus 1n Figs. 1', 2, and 9, the group of tubes 1s arranged in a circle,

whereas in Figs. 5 to 8, the tubes 16a, are`A arranged in a straight row or common plane and project from the plate or head i5". The stream consisting' of a mixture of' pow'- dered it'uel and air in traversing the casi and tubes is thoroughly mixed and subdivided and thus the particles of fuel are diiLlfused or tl'iortfughly mixed with the air and all of them arev well supplied with .air whereby they are all rapidly ignited and their combustion is made complete. Vifithin .the ca sing lat, there is shown a cone, pyramid or spreader i?, the wall of which is provided with grooves i8, corresponding in number with the tubes 16.

In Figs. 7 and S, 17a, is the spreader and consists of vertical partitions, and in Fig.' 5, there is no spreader, but the plate or head 15, serves to subdivide the mixture of powdered fuel and air and permit the subdivisions to to the various tubes. The number ofv tubes is not an important feature of the invention and While twelve tubes are shown in Fig. V2, the number may be increased or diminished. rEhe tubes project through a plate 19, carried by the hood 20,

' burned.

and this plate may be, if desired, faced `with asbestos. 2l, is an opening which is provided with a. movable lid, shown in dotted lines in Fig. 3, adapted to Wholly or partly cover it and which may be formed through the plate 19 and through which air may be perinittcdito enter in the midst of the group of tubes. f The ends of the tubes Fig. are Vshown fitted with sleeves 2Q, which may be 'removed and replaced by others in case tiey should be burned or' otherwise injuriouslyglatfected by heat. The grooved cone, pyrijmid, or spreader, when present, facilitatesy the breaking up of the of mixed air and fuel issuing from 'the easing (3, and perfects the mixture of air and pouu dered coal. or lother fuel, and assists in directinglihe same to and through 'the tubes lo.'

In 9, a, is a tube having a flaring end al, which receives the thorough mixture of air and fuel discharged from the group of tubes. This tube a, when present affords means for concentrating the mixture and directing the flame into impingcnicnt upon the 'material The edge of the end al, may be perforated and have applied to it a perforated movable ring, thus inakingva register-like arrangement having openings a2, toil air which openings may be made larger or smaller.

ln use the jet issuing from the nozzle i,-

may be of comparatively low j nessure, such as seven ounces, and since it is discharged in advance of the fuel. inlet S, it sucks the fuel forward. The srea y consisting of a mixture of air and fuel is thoroughly mixedv and sub-divided and the subdivisions are projected from the discharge ends of the various tubes 1G, either directly into, for example, the body of rotary kiln 5, jlvvhcre the mixture of fuel and airissuing from each ofthe tubes is burned, additional air, if nece rf, being supplied by Way of the opening 2.1,] or into the tube o, from which 'they issue and are burned. The r suit the vsubdivision of the mixture oi air and fuel is to distribute or diffuse the fuel so that all the particles are quickly ignited and The separate jets each presenta comparatively small cool cone or space of poor combustion near the root, and in the aggregate these cool cones or spaces of poor combustion are negligible. The effective heat per unit of fuel consumption isincieased by reason of tlie'describcd subdivision and separate burning of the subdivisions. .For example in burningcement by means of the described burner, from to 8O pounds df powdered fuel are retpiired per barrel in stead of from 11.5 to 120 pounds per barrel, which arg required `with burners in which the mixture of coal and airis not. subldivided prior to injection' and burning.

The tubes as has been said, are straight and their axesare parallel with the axis of -vided with an inlet for avith an air nozzle terminating in advance steels the casing 6, and nozzle T, or otherwise expressed, with the direction of motion of the stream consisting of a mixture of air ant1 powdered fuel which they receive in subdivided condition.

lllhat We claim is, l. A fuel feeder provided with means for establishing a stream consisting of a mixture of air and powdered fuel and With a plurality of straight tubes and having, intermediate of the tubes and means, an 'expanded mixing chamber communicating with the tubes and means, and the axes'of the tubes being parallelvvitli each other and with' the axis of the means, whereby the air and fuel in traversing the feeder are thoroughly mixed and are'discharged in lines parallel 'with the axis of the means for foriningthe stream of the air and fuelniixture.

2. A fuel feeder provided with means for establishing a stream consisting of a mixture of air and powdered fuel and With a plurality of straight tubes and having, intermediate ot' the tubes and means, an expanded mixing chamber communicating with the tubes and means, said chamber provided 'with means forsub-divid'ing the stream and the -axes of the tubes being parallel With.

nach other and with the axis ofthe means, whereby the mixture is discharged in lines parallel with the axis of the means for forming the stream of the air and fuel mixture, substantially as described.

A. fuel feeder comprising a casing proowdered fuel and of the inlet, a conical shell having a head and communicating at its apex With the discharge eiid of the casing and provided interually with a cone or pyramid having grooves or passages in its Wall, and a series of tubes projecting from the head of the shell near the periphery and alined With the grooves, substantially as described.

A fuel feeder comprisino' a casing provided ivith an inlet for powdered fuel and with an air nozzle terminating in advance of the inlet, a conical shelllhav-iiig head and communicating at its apex with the discharge end of the Acasing and provided internally with a conical or pyramidical deficctor having grooves or passages in its Wall, a series oftubes projecting from the head of the shell near its periphery and alined with tlie grooves in the delector, and a hood plate through which the tubes pass and which is' provided With an air opening, substantially as described.

ln apparatus of the typo recited the combination of a casing provided with a fuel inlet and an air nozzle, a pair of out- Wai-diy `flaring shells between which the` mixture of airand fuel passes, and a series iio ` inl the other and which serve to direct the Aeaeh other and with the axis of the shell,

shells parallel with the axes thereof and through which the mixture is discharged, substantially as described.

f6. In apparatus ,of the type recited the combination with the series of straight tubes of a pair of flaring shells arranged one withmixture to the tubes, substantially as described.

7. A fuel feeder comprising a flarinv shell terminatin in a head or plate and adapted to receive a mixture of air and powdered fuel, and strain-ht burner tubes arranged parallel with eafh other and projecting from the head or plate in line with the axis of the shell and adapted to receive sub-divisions of the mixture, substantially as described. .I

v8. A fuel feeder comprising a flaring shell adapted to receive a stream of powdered fuel and air and provided With separate straight burner tubes arranged parallel with and a spreader arranged in the shell fordii recting sub-divisions of the mixture to the respective tubes, substantially as described.

9. A`uel feeder comprisin a' casing provided with an'inlet for pow ered fuel and With an air nozzle, a conical shell communicating at its smaller end With'the discharge end of the casing and having a head at its other end, a cone arranged in said shell with its apex toward the inlet end and having grooves or passages in its wall, a series of tubes projecting 'from said head and through which fuel from the shellpasses,

`and a discharge tube having a flaring end provided with a head which receives said tubes, substantially as described.

In testimony Whereowe have hereunto lsigned our names 1n the presence of Wit- IIESSGS.

VILLIAM H.- HAR-DING. CHARLES M. SAEGER. Witnesses: JOHN B. PAxr'roN,

JOHN B. PAT'roNJr.,

FRANK E. FRENCH. 

